US9836465B2 - Methods and systems for providing file data for a media file - Google Patents

Methods and systems for providing file data for a media file Download PDF

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US9836465B2
US9836465B2 US14/375,708 US201314375708A US9836465B2 US 9836465 B2 US9836465 B2 US 9836465B2 US 201314375708 A US201314375708 A US 201314375708A US 9836465 B2 US9836465 B2 US 9836465B2
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file
essence data
data
media file
program
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US20140379765A1 (en
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Simon Darryl Rogers
James Westland Cain
Michael James Weaver
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Grass Valley Ltd
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Quantel Ltd
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    • G06F17/3007—
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/10—File systems; File servers
    • G06F16/11—File system administration, e.g. details of archiving or snapshots
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/85—Assembly of content; Generation of multimedia applications
    • H04N21/854—Content authoring
    • H04N21/8543—Content authoring using a description language, e.g. Multimedia and Hypermedia information coding Expert Group [MHEG], eXtensible Markup Language [XML]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/10—File systems; File servers
    • G06F16/13—File access structures, e.g. distributed indices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/50—Information retrieval; Database structures therefor; File system structures therefor of still image data
    • G06F16/51—Indexing; Data structures therefor; Storage structures
    • G06F17/30091—
    • G06F17/3028—
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
    • G11B27/031—Electronic editing of digitised analogue information signals, e.g. audio or video signals
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/102—Programmed access in sequence to addressed parts of tracks of operating record carriers
    • G11B27/105—Programmed access in sequence to addressed parts of tracks of operating record carriers of operating discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
    • G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
    • H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
    • H04N21/234309—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements by transcoding between formats or standards, e.g. from MPEG-2 to MPEG-4 or from Quicktime to Realvideo
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6125—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via Internet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
    • H04N21/845—Structuring of content, e.g. decomposing content into time segments
    • H04N21/8456—Structuring of content, e.g. decomposing content into time segments by decomposing the content in the time domain, e.g. in time segments
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/85—Assembly of content; Generation of multimedia applications
    • H04N21/854—Content authoring
    • H04N21/85406—Content authoring involving a specific file format, e.g. MP4 format

Definitions

  • the present invention concerns methods and systems for providing file data for a media file. More particularly, but not exclusively, the invention concerns the generation of a media file from a stream of essence data in such a way that essence data from the media file can be provided before all essence data has been obtained from the stream.
  • the provision of the programme as a file T means that random access to any piece of data within the file T may be required. Consequently, the conversion process C expects the entire file T to be available within the file system prior to the conversion process beginning. Requiring the entire file T to be available introduces a large time overhead for the availability of the file T′ for transmitting over the Internet, as conversion can only begin once the entire file T is available, which consequently means that the programme the file represents must have finished. This is a particular issue when the programme is of a live event, as it is not then possible to obtain the file T ahead of time.
  • One partial solution to reducing the time overhead is to reduce the time taken by the conversion process C, by providing additional computing power. However, even if unlimited computing power were available, with the result that the time for conversion was effectively reduced to zero, the necessity to wait until the programme had finished before conversion could begin would still remain.
  • file systems While random access to data from anywhere within a file is allowed, in order to avoid the delay associated with waiting for the writing of a file to complete, file systems will commonly allow data to be read from a file while its content is still being written to the file system, even though this means that the entire file is not yet available.
  • Specialised file formats are known which are intended to be read from while still being written to. Such files consist of a series of segments each containing an index indicating where data can be found in that segment. Thus, if data is written to the file sequentially it can be read sequentially without later parts of the file needing to be referred to. However, the use of these requires that both the writing and the reading of the file occur in a well-behaved manner, which cannot be relied upon. Further, it would be advantageous to provide a solution that can be used with existing devices and the standard file formats they use.
  • Another solution is to modify the device that implements the conversion process so that it is able to accept streamed data rather than a file.
  • Another solution is to modify the device that implements the conversion process so that it is able to accept streamed data rather than a file.
  • the present invention seeks to mitigate the above-mentioned problems. Alternatively and/or additionally, the present invention seeks to provide an improved file system that provides essence data for a media file in a way that does not require the contents of the entire file to be available before any file data can be provided.
  • a method of providing file data for a media file of a pre-determined format from a file system comprising a file record database and a data store, wherein the media file corresponds to a programme comprising the steps of:
  • the file system is able to use the duration of the programme to determine the layout of the media file, in particular the length of the media file and how the data it will contain will be arranged. This enables the file system to create a file record for the media file, and to provide details of the location that essence data will have within the file even though that essence data has not yet been received. (So for example, if the pre-determined file format has an index indicating the location of essence data within the file, the file system could create the index for the file in advance of the essence data being available.) Subsequently, as the essence data is received via the stream, the file system is able to create and return the corresponding essence data making up the media file, even though later essence data has not yet been received.
  • the file system determines the layout of the file, and then receives the essence via the stream for use by the file system when creating the contents of the media file, the file system maintains control over the contents of the file. This is in contrast to a conventional file system in which the file would be written to the file system, and the file system would simply receive the data making up the file without having any control over (or knowledge of) the internal structure of the file or what the data it is receiving represents, the order in which the data is received, or whether any data is re-written.
  • the file system appears to present an ordinary file in response to a request to open and read a file, allowing it to be used with existing devices (such as transcoders).
  • the file system is able to reliably return the contents of the media file when requested even if the essence data used to generate subsequent contents of the file has not yet been received (or even created, for example in the case that the programme if of a live event).
  • the file is not being supplied via an ordinary file system write operation, i.e. from “outside” the file system, but rather the creation of the file from the essence data is done “inside” the file system using the stream of essence data, and is invisible to any device reading the file.
  • the entire media file does not need to be available before the data it contains can begin to be reliably read by another device.
  • the programme may be of a live event, for example a sporting or news event.
  • the programme may be only part of a complete broadcast event (for example only the first half of a football match), or may comprise multiple broadcast events, and may include idents, advertisements and the like.
  • the format of the media file requires that it comprise a plurality of segments of essence data located at pre-declared locations within the file, and wherein the determining of the layout of the media file comprises the steps of:
  • the generated essence data comprises the essence data derived from the received essence data and padding data to give the generated essence data the maximum segment length.
  • each segment may correspond to a section of media of a predetermined duration.
  • the maximum segment length may be at least the maximum possible length of file data corresponding to a section of media of the pre-determined time duration. The maximum segment length may be calculated by assuming a minimum possible compression of the file data making up a segment.
  • the format of the media file is MXF.
  • the format may be any other suitable video format.
  • the invention is particularly advantageous when the format of the file is a compressed file format, for example MPEG-2 or MPEG-4 with intra-frame or GOP compression, fragmented MPEG-4, VC-1, Apple ProRes, etc., it is equally applicable when the format of the file is a non-compressed file format, for example Quicktime, uncompressed MPEG-4, AVI, WAV, etc.
  • the method further comprises the step of delaying the return of requested essence data to vary the speed with which essence data is provided by the file system. This can help avoid an excessive delay between a request for essence data from the media file being made and the essence data being returned, helping to avoid the possibility that the request will time out.
  • the requests for essence data are made by a software application that requests essence data derived from the received essence data sequentially.
  • a software application acting in such a manner enables the file system to return essence data as the corresponding essence data is received via the stream, preventing excessive delays in responding to requests.
  • the method further comprises the step of studying the behaviour of the software application to determine that it will request the essence data sequentially. This allows software applications that are suitable for use with the file system to be identified.
  • a file system for providing file data for a media file of a pre-determined format corresponding to a programme, wherein the file system comprises a file record database and a data store, and wherein the file system is arranged to:
  • the format of the media file requires that it comprise a plurality of segments of essence data located at pre-declared locations within the file, and wherein the file system is arranged, when determining of the layout of the media file, to:
  • the format of the media file is MPEG-4.
  • the file system is further arranged to delay the return of requested essence data to vary the speed with which essence data is provided by the file system.
  • a computer network comprising:
  • a computer device arranged to request the media file from the file system
  • the computer device is arranged to request essence data derived from the received essence data sequentially.
  • a computer program product arranged, when executed on a computing device, to provide a file system as described above.
  • FIG. 1 is a diagram representing a conventional method of converting a media file for transmittal over the Internet
  • FIG. 2 is a network including a file system in accordance with a first embodiment of the invention
  • FIG. 3 is a flow chart showing the operation of the file system of FIG. 2 when generating a media file from a stream of essence data;
  • FIG. 4 shows the structure of the media file generated by the file system of FIG. 2 ;
  • FIG. 5 is a flow chart showing the operation of the file system of FIG. 2 in response to a request for the media file
  • FIG. 6 is a diagram representing the method of converting a media file for transmittal over the Internet of the file system of FIG. 2 .
  • a file system 11 comprises a data store 12 , a file record database 13 , and a gateway 14 .
  • the file system 11 is in communication via the gateway 14 with a network 15 .
  • a device 17 running a “qualified” software application, as described in detail later below, is in communication with the file system 11 via the network 15 .
  • the gateway 14 is arranged to receive a stream 16 of essence data (data constituting video and/or audio information) for a programme such as a televised sporting event.
  • the file system 11 is arranged to use this stream 16 of essence data to generate a media file, as described below.
  • FIG. 3 is a flow chart showing the operation of the file system 11 when generating the file from the stream 16 of essence data. Initially, the file system 11 will receive details regarding the programme and the file to be produced, including for example the length of the programme, and the quality and format of the file to be generated (step 31 ).
  • the file system 11 uses this information to determine the structure of the file to be generated (step 32 ).
  • An example file structure is shown in FIG. 4 .
  • the file structure 40 is for an MXF file, and comprises an index 41 , and a plurality of GOPs (“groups of pictures”) 42 a , 42 b , 42 c to 42 d .
  • a GOP is a series of images making up a particular sequence of video of a particular duration. The details received include the length of the programme, allowing the number of GOPs and the duration of video within them to be determined.
  • the images in a GOP are compressed, which would usually result in the GOPs being of different lengths (i.e. being made up of a different number of bytes).
  • One reason for this is that the video a GOP represents will compress to a different size depending on the nature of the images making up the video; for example, as compression techniques include identifying the differences between images in a series, a series of very similar images will generally be compressed to a much smaller size than a series of images in which differ substantially from each other.
  • the location of a GOP in a file will depend on the size of each preceding GOP, and the index 41 provides a mapping from time ranges of video to byte ranges in the file 40 , thus allowing the GOP (or GOPs) corresponding to a particular time range of video to be found.
  • the GOPs 42 a to 42 d are all of the same size. This is achieved by having the file system 11 predetermine a size for each GOP. (It is important to note that the essence data making up the GOPs has not yet been received from the stream 16 , and so the exact size of the compressed essence data each GOP will contain cannot be determined.) The size of each GOP is determined by calculating the minimum possible compression, and so maximum possible byte range, of the images making up the GOPs. The actual size of each GOP in the structure is then taken to be at least this maximum possible size.
  • the file system 11 then generates a file record for the file and stores it in the file record database 13 (step 33 ).
  • the file record will contain certain details about the file such, as its size, obtained from the structure of the file determined in the previous step.
  • the index 41 for the file is then generated (step 34 ), again using the determined structure of the file and in particular using the predetermined sizes of the GOPs 42 a to 42 d.
  • the file system 11 will begin to receive essence data via the stream 16 (step 35 ).
  • the file system 11 uses the essence data to generate the contents of the GOPs (step 36 ), with the data being compressed and distributed between the GOPs according to the predetermined structure of the file.
  • the length of any GOP is determined to be at least the minimum possible compression of the images in a GOP.
  • the images will in the vast majority of cases compress to less than the minimum possible size, and in this case the free space within a GOP is filled with blank padding data.
  • File structures for other file formats may also be determined in an analogous manner, for example fragmented MPEG-4 format in which files comprise both an index at the beginning and a footer at the end, indicating where data is located within the file.
  • Other file formats that may be used include compressed file formats such as MPEG-2 or MPEG-4 with intra-frame or GOP compression, VC-1, Apple ProRes, etc., and non-compressed file formats such Quicktime, uncompressed MPEG-4, AVI, WAV, etc.
  • the index of the file and the contents of the GOPs are generated as soon as it is possible to do so, in other words the index is generated when the details of the file and programme are received, and the GOP contents are generated as soon as the required essence data is received in the stream 16 .
  • the index and GOP contents are generated only when required, for example the index may be generated only when the file is actually requested, and the GOP contents may be generated only when the corresponding file data is requested, with the essence data in the meantime being stored in the data store 12 as it is provided by the stream 16 .
  • a qualified software application is a software application that has been identified as accessing the data of a media file in a particular predictable and well-behaved manner, as now described.
  • a characteristic of a file system is that it allows random access to a file, in other words any arbitrary data from the file can be requested.
  • the inventor(s) have identified that certain software applications do not take advantage of the random access the file system provides, but rather access data from a file in a predictable manner. Any software application that is identified as reading the data from the file in a well-behaved manner that is suitable for the present invention is considered to be “qualified”.
  • a software application is qualified if it only accesses data from the file that corresponds to essence data provided by the stream 16 sequentially, meaning that the software application does not try to access data from the file corresponding to later essence data out of sequence.
  • a software application that transcoded a file e.g. to convert it into a format and quality suitable for transmitting over the Internet
  • the index need not be located at the beginning of the file, and could be located at the end or there could be indexes at both the beginning and end, for example.
  • a software application need not be so well-behaved in order to be qualified; an application could read or re-read the index or any GOP already read at any time, or even read GOP data from the end of the file as long as that GOP data could be provided without requiring corresponding essence data from the stream 16 .
  • transcoding is only one example of software application functionality that may result in a software application being qualified, and the invention equally applies to access by a qualified software application with any function.
  • any device, software service or the like may be identified as accessing a file in a well-behaved manner that allows it to be considered to be a qualified device, qualified software service, etc.
  • the file system 11 will receive a request to read a file (step 51 ).
  • the file system 11 returns a file handle linked to the file record for the file that was stored in the file record database 13 (step 52 ).
  • the file system 11 will receive a request for data from the file corresponding to the index of the file (step 53 ), which the file system 11 returns to the device 17 (step 54 ). Again, it can be seen that this can be provided before any of the essence data for the file has been provided by the stream 16 . This is because the location of the GOPs within the file is predetermined based on their maximum possible size, allowing the index to be generated before the essence data making up the GOPs is known. This is unlike conventional systems in which the location of any GOP is dependent upon the compression possible for any preceding GOP, and so the index can only be generated once all GOPs have been generated, requiring all essence data to be available.
  • the file system 11 will receive a request for data making up a GOP (step 55 ), which it returns (step 56 ). Again, because the software application running on the device 17 behaves in a well-behaved manner, the data requested will initially correspond to the first GOP in the file. This means that the data can be returned as soon as the essence data for that GOP only has been provided by the stream, without the essence data for all GOPs needing to be available as in a conventional system.
  • the file system 11 will then receive requests for data from the subsequent GOPs in turn, and will return the relevant data (steps 55 and 56 repeated), with the file system 11 being able to return the data for a GOP as soon as the relevant essence data has been provided by the stream 11 .
  • FIG. 6 shows the effect of the invention when using a file to transmit a television programme over the Internet.
  • the conversion of the file T into the file T′, as indicated by the bar C can safely begin as soon as the essence data for the GOPs within the file becomes available, rather than the conversion having to wait until the entire file T is available before data can safely be read.
  • the conversion process C in this example in fact takes longer than in the conventional example. This is because the conversion can only occur in real time as the contents of the file T is made available, rather than in the conventional example in which the entirety of the file T is available when the conversion begins. However, as the conversion begins while the file T is still being created, the file T′ is nevertheless available in full only shortly after the file T has been completed.
  • the speed of the conversion is therefore not a disadvantage, and in fact is advantageous as it means that there is no reason to use a large amount of computing power, with the attendant expense, in order to reduce the time the conversion takes as much as possible.
  • the file system 11 is able to return GOPs almost immediately after the corresponding essence data has been received.
  • the behaviour of the device 17 may be such that a request for a GOP is made substantially in advance of the corresponding essence data having been received by the file system 11 .
  • This can result in a request for a GOP timing out, i.e. the data constituting the GOP is not returned within the maximum time allowed.
  • the file system 11 can delay the return of earlier GOPs. This will in turn delay future requests made by the device 17 , thus ensuring (or trying to ensure) that the required essence data is received within a sufficiently small time from the request being made, so that such timeouts do not occur.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Databases & Information Systems (AREA)
  • General Physics & Mathematics (AREA)
  • Data Mining & Analysis (AREA)
  • Computer Security & Cryptography (AREA)
  • Software Systems (AREA)
  • Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
  • Information Transfer Between Computers (AREA)
  • Television Signal Processing For Recording (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
US14/375,708 2012-02-03 2013-01-24 Methods and systems for providing file data for a media file Active 2034-02-01 US9836465B2 (en)

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GB1201993.1 2012-02-03
GB1201993.1A GB2499039B (en) 2012-02-03 2012-02-03 Methods and systems for providing file data for a media file
PCT/GB2013/050156 WO2013114082A1 (en) 2012-02-03 2013-01-24 Methods and systems for providing file data for a media file

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GB2499040B (en) 2012-02-03 2019-06-19 Quantel Ltd Methods and systems for providing file data for a media file
GB2549471A (en) * 2016-04-15 2017-10-25 Quantel Ltd Methods of streaming media file data and media file servers
US11824751B2 (en) * 2020-04-21 2023-11-21 Grass Valley Canada System and method for controlling distribution of media content in a distributed system

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EP2812813A1 (de) 2014-12-17
AU2013214023A1 (en) 2014-09-18
NZ628120A (en) 2016-03-31
GB2499039B (en) 2019-06-19
GB201201993D0 (en) 2012-03-21
US20140379765A1 (en) 2014-12-25
CA2863191A1 (en) 2013-08-08
JP2015512188A (ja) 2015-04-23
EP2812813B1 (de) 2018-07-04
GB2499039A (en) 2013-08-07

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